Commit | Line | Data |
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65e7ae7b OG |
1 | /* |
2 | * iSCSI Initiator over iSER Data-Path | |
3 | * | |
4 | * Copyright (C) 2004 Dmitry Yusupov | |
5 | * Copyright (C) 2004 Alex Aizman | |
6 | * Copyright (C) 2005 Mike Christie | |
7 | * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. | |
28f292e8 | 8 | * Copyright (c) 2013 Mellanox Technologies. All rights reserved. |
65e7ae7b OG |
9 | * maintained by openib-general@openib.org |
10 | * | |
11 | * This software is available to you under a choice of one of two | |
12 | * licenses. You may choose to be licensed under the terms of the GNU | |
13 | * General Public License (GPL) Version 2, available from the file | |
14 | * COPYING in the main directory of this source tree, or the | |
15 | * OpenIB.org BSD license below: | |
16 | * | |
17 | * Redistribution and use in source and binary forms, with or | |
18 | * without modification, are permitted provided that the following | |
19 | * conditions are met: | |
20 | * | |
21 | * - Redistributions of source code must retain the above | |
22 | * copyright notice, this list of conditions and the following | |
23 | * disclaimer. | |
24 | * | |
25 | * - Redistributions in binary form must reproduce the above | |
26 | * copyright notice, this list of conditions and the following | |
27 | * disclaimer in the documentation and/or other materials | |
28 | * provided with the distribution. | |
29 | * | |
30 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
31 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
32 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
33 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
34 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
35 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
36 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
37 | * SOFTWARE. | |
38 | * | |
39 | * Credits: | |
40 | * Christoph Hellwig | |
41 | * FUJITA Tomonori | |
42 | * Arne Redlich | |
43 | * Zhenyu Wang | |
44 | * Modified by: | |
45 | * Erez Zilber | |
65e7ae7b OG |
46 | */ |
47 | ||
48 | #include <linux/types.h> | |
49 | #include <linux/list.h> | |
50 | #include <linux/hardirq.h> | |
51 | #include <linux/kfifo.h> | |
52 | #include <linux/blkdev.h> | |
53 | #include <linux/init.h> | |
54 | #include <linux/ioctl.h> | |
65e7ae7b OG |
55 | #include <linux/cdev.h> |
56 | #include <linux/in.h> | |
57 | #include <linux/net.h> | |
58 | #include <linux/scatterlist.h> | |
59 | #include <linux/delay.h> | |
5a0e3ad6 | 60 | #include <linux/slab.h> |
e4dd23d7 | 61 | #include <linux/module.h> |
65e7ae7b OG |
62 | |
63 | #include <net/sock.h> | |
64 | ||
65 | #include <asm/uaccess.h> | |
66 | ||
67 | #include <scsi/scsi_cmnd.h> | |
68 | #include <scsi/scsi_device.h> | |
69 | #include <scsi/scsi_eh.h> | |
70 | #include <scsi/scsi_tcq.h> | |
71 | #include <scsi/scsi_host.h> | |
72 | #include <scsi/scsi.h> | |
73 | #include <scsi/scsi_transport_iscsi.h> | |
74 | ||
75 | #include "iscsi_iser.h" | |
76 | ||
75613521 MC |
77 | static struct scsi_host_template iscsi_iser_sht; |
78 | static struct iscsi_transport iscsi_iser_transport; | |
79 | static struct scsi_transport_template *iscsi_iser_scsi_transport; | |
80 | ||
65e7ae7b OG |
81 | static unsigned int iscsi_max_lun = 512; |
82 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
83 | ||
84 | int iser_debug_level = 0; | |
85 | ||
c1d786e6 | 86 | MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); |
65e7ae7b OG |
87 | MODULE_LICENSE("Dual BSD/GPL"); |
88 | MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); | |
c1d786e6 | 89 | MODULE_VERSION(DRV_VER); |
65e7ae7b OG |
90 | |
91 | module_param_named(debug_level, iser_debug_level, int, 0644); | |
92 | MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); | |
93 | ||
94 | struct iser_global ig; | |
95 | ||
96 | void | |
97 | iscsi_iser_recv(struct iscsi_conn *conn, | |
98 | struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) | |
99 | { | |
100 | int rc = 0; | |
65e7ae7b OG |
101 | int datalen; |
102 | int ahslen; | |
103 | ||
104 | /* verify PDU length */ | |
105 | datalen = ntoh24(hdr->dlength); | |
200ae1a0 OG |
106 | if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { |
107 | iser_err("wrong datalen %d (hdr), %d (IB)\n", | |
108 | datalen, rx_data_len); | |
65e7ae7b OG |
109 | rc = ISCSI_ERR_DATALEN; |
110 | goto error; | |
111 | } | |
112 | ||
200ae1a0 OG |
113 | if (datalen != rx_data_len) |
114 | iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", | |
115 | datalen, rx_data_len); | |
116 | ||
65e7ae7b OG |
117 | /* read AHS */ |
118 | ahslen = hdr->hlength * 4; | |
119 | ||
0af967f5 | 120 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
65e7ae7b OG |
121 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
122 | goto error; | |
123 | ||
124 | return; | |
125 | error: | |
126 | iscsi_conn_failure(conn, rc); | |
127 | } | |
128 | ||
2ff79d52 | 129 | static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
0f9c7449 MC |
130 | { |
131 | struct iscsi_iser_task *iser_task = task->dd_data; | |
132 | ||
133 | task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; | |
134 | task->hdr_max = sizeof(iser_task->desc.iscsi_header); | |
135 | return 0; | |
136 | } | |
65e7ae7b | 137 | |
f19624aa OG |
138 | int iser_initialize_task_headers(struct iscsi_task *task, |
139 | struct iser_tx_desc *tx_desc) | |
140 | { | |
141 | struct iscsi_iser_conn *iser_conn = task->conn->dd_data; | |
142 | struct iser_device *device = iser_conn->ib_conn->device; | |
143 | struct iscsi_iser_task *iser_task = task->dd_data; | |
144 | u64 dma_addr; | |
145 | ||
146 | dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, | |
147 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
148 | if (ib_dma_mapping_error(device->ib_device, dma_addr)) | |
149 | return -ENOMEM; | |
150 | ||
151 | tx_desc->dma_addr = dma_addr; | |
152 | tx_desc->tx_sg[0].addr = tx_desc->dma_addr; | |
153 | tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; | |
154 | tx_desc->tx_sg[0].lkey = device->mr->lkey; | |
155 | ||
f19624aa OG |
156 | iser_task->iser_conn = iser_conn; |
157 | return 0; | |
158 | } | |
65e7ae7b | 159 | /** |
2261ec3d MC |
160 | * iscsi_iser_task_init - Initialize task |
161 | * @task: iscsi task | |
65e7ae7b | 162 | * |
2261ec3d | 163 | * Initialize the task for the scsi command or mgmt command. |
2747fdb2 | 164 | */ |
a8ac6311 | 165 | static int |
2261ec3d | 166 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 167 | { |
2261ec3d | 168 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 169 | |
52439540 | 170 | if (iser_initialize_task_headers(task, &iser_task->desc)) |
f19624aa OG |
171 | return -ENOMEM; |
172 | ||
2261ec3d | 173 | /* mgmt task */ |
f19624aa | 174 | if (!task->sc) |
2747fdb2 | 175 | return 0; |
65e7ae7b | 176 | |
2261ec3d | 177 | iser_task->command_sent = 0; |
2261ec3d | 178 | iser_task_rdma_init(iser_task); |
a8ac6311 | 179 | return 0; |
65e7ae7b OG |
180 | } |
181 | ||
182 | /** | |
2261ec3d | 183 | * iscsi_iser_mtask_xmit - xmit management(immediate) task |
65e7ae7b | 184 | * @conn: iscsi connection |
2261ec3d | 185 | * @task: task management task |
65e7ae7b OG |
186 | * |
187 | * Notes: | |
188 | * The function can return -EAGAIN in which case caller must | |
189 | * call it again later, or recover. '0' return code means successful | |
190 | * xmit. | |
191 | * | |
192 | **/ | |
193 | static int | |
2261ec3d | 194 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
195 | { |
196 | int error = 0; | |
197 | ||
962b4b52 | 198 | iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 199 | |
2261ec3d | 200 | error = iser_send_control(conn, task); |
65e7ae7b | 201 | |
2261ec3d | 202 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
203 | * right after sending them. |
204 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
205 | * - if yes, the task is recycled at iscsi_complete_pdu |
206 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 207 | */ |
65e7ae7b OG |
208 | return error; |
209 | } | |
210 | ||
211 | static int | |
2747fdb2 | 212 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 213 | struct iscsi_task *task) |
65e7ae7b | 214 | { |
0f9c7449 MC |
215 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
216 | struct iscsi_data hdr; | |
65e7ae7b | 217 | int error = 0; |
65e7ae7b OG |
218 | |
219 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
220 | while (iscsi_task_has_unsol_data(task)) { |
221 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 222 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 223 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
224 | |
225 | /* the buffer description has been passed with the command */ | |
226 | /* Send the command */ | |
2261ec3d | 227 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 228 | if (error) { |
0f9c7449 | 229 | r2t->datasn--; |
2747fdb2 | 230 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 231 | } |
0f9c7449 | 232 | r2t->sent += r2t->data_count; |
48a237a2 | 233 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 234 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
235 | } |
236 | ||
2747fdb2 | 237 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
238 | return error; |
239 | } | |
240 | ||
241 | static int | |
2261ec3d | 242 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 243 | { |
2261ec3d MC |
244 | struct iscsi_conn *conn = task->conn; |
245 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
246 | int error = 0; |
247 | ||
2261ec3d MC |
248 | if (!task->sc) |
249 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 250 | |
2261ec3d MC |
251 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
252 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 253 | |
48a237a2 | 254 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 255 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 256 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
257 | } |
258 | ||
962b4b52 | 259 | iser_dbg("ctask xmit [cid %d itt 0x%x]\n", |
2261ec3d | 260 | conn->id, task->itt); |
65e7ae7b | 261 | |
65e7ae7b | 262 | /* Send the cmd PDU */ |
2261ec3d MC |
263 | if (!iser_task->command_sent) { |
264 | error = iser_send_command(conn, task); | |
65e7ae7b | 265 | if (error) |
2747fdb2 | 266 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 267 | iser_task->command_sent = 1; |
65e7ae7b OG |
268 | } |
269 | ||
270 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 271 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 272 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 273 | |
2747fdb2 | 274 | iscsi_iser_task_xmit_exit: |
65e7ae7b OG |
275 | return error; |
276 | } | |
277 | ||
0f9c7449 | 278 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 279 | { |
2261ec3d | 280 | struct iscsi_iser_task *iser_task = task->dd_data; |
52439540 OG |
281 | struct iser_tx_desc *tx_desc = &iser_task->desc; |
282 | ||
283 | struct iscsi_iser_conn *iser_conn = task->conn->dd_data; | |
284 | struct iser_device *device = iser_conn->ib_conn->device; | |
285 | ||
286 | ib_dma_unmap_single(device->ib_device, | |
287 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
65e7ae7b | 288 | |
b3cd5050 MC |
289 | /* mgmt tasks do not need special cleanup */ |
290 | if (!task->sc) | |
2747fdb2 | 291 | return; |
65e7ae7b | 292 | |
2261ec3d MC |
293 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
294 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
295 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 296 | } |
65e7ae7b OG |
297 | } |
298 | ||
299 | static struct iscsi_cls_conn * | |
300 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
301 | { | |
302 | struct iscsi_conn *conn; | |
303 | struct iscsi_cls_conn *cls_conn; | |
304 | struct iscsi_iser_conn *iser_conn; | |
305 | ||
5d91e209 | 306 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); |
65e7ae7b OG |
307 | if (!cls_conn) |
308 | return NULL; | |
309 | conn = cls_conn->dd_data; | |
310 | ||
311 | /* | |
312 | * due to issues with the login code re iser sematics | |
313 | * this not set in iscsi_conn_setup - FIXME | |
314 | */ | |
bcc60c38 | 315 | conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
65e7ae7b | 316 | |
5d91e209 | 317 | iser_conn = conn->dd_data; |
65e7ae7b OG |
318 | conn->dd_data = iser_conn; |
319 | iser_conn->iscsi_conn = conn; | |
320 | ||
321 | return cls_conn; | |
65e7ae7b OG |
322 | } |
323 | ||
324 | static void | |
325 | iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) | |
326 | { | |
327 | struct iscsi_conn *conn = cls_conn->dd_data; | |
328 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
b40977d9 | 329 | struct iser_conn *ib_conn = iser_conn->ib_conn; |
65e7ae7b OG |
330 | |
331 | iscsi_conn_teardown(cls_conn); | |
b40977d9 MC |
332 | /* |
333 | * Userspace will normally call the stop callback and | |
334 | * already have freed the ib_conn, but if it goofed up then | |
335 | * we free it here. | |
336 | */ | |
337 | if (ib_conn) { | |
338 | ib_conn->iser_conn = NULL; | |
39ff05db | 339 | iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ |
b40977d9 | 340 | } |
65e7ae7b OG |
341 | } |
342 | ||
343 | static int | |
344 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
345 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
346 | int is_leading) | |
347 | { | |
348 | struct iscsi_conn *conn = cls_conn->dd_data; | |
349 | struct iscsi_iser_conn *iser_conn; | |
350 | struct iser_conn *ib_conn; | |
412eeafa | 351 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
352 | int error; |
353 | ||
354 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
355 | if (error) | |
356 | return error; | |
357 | ||
358 | /* the transport ep handle comes from user space so it must be | |
359 | * verified against the global ib connections list */ | |
412eeafa MC |
360 | ep = iscsi_lookup_endpoint(transport_eph); |
361 | if (!ep) { | |
65e7ae7b OG |
362 | iser_err("can't bind eph %llx\n", |
363 | (unsigned long long)transport_eph); | |
364 | return -EINVAL; | |
365 | } | |
412eeafa MC |
366 | ib_conn = ep->dd_data; |
367 | ||
89e984e2 OG |
368 | if (iser_alloc_rx_descriptors(ib_conn)) |
369 | return -ENOMEM; | |
370 | ||
65e7ae7b OG |
371 | /* binds the iSER connection retrieved from the previously |
372 | * connected ep_handle to the iSCSI layer connection. exchanges | |
373 | * connection pointers */ | |
4f363882 RD |
374 | iser_info("binding iscsi/iser conn %p %p to ib_conn %p\n", |
375 | conn, conn->dd_data, ib_conn); | |
65e7ae7b OG |
376 | iser_conn = conn->dd_data; |
377 | ib_conn->iser_conn = iser_conn; | |
378 | iser_conn->ib_conn = ib_conn; | |
39ff05db | 379 | iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ |
65e7ae7b OG |
380 | return 0; |
381 | } | |
65e7ae7b | 382 | |
b40977d9 MC |
383 | static void |
384 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
385 | { | |
386 | struct iscsi_conn *conn = cls_conn->dd_data; | |
387 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
388 | struct iser_conn *ib_conn = iser_conn->ib_conn; | |
65e7ae7b | 389 | |
b40977d9 | 390 | /* |
913e5bf4 MC |
391 | * Userspace may have goofed up and not bound the connection or |
392 | * might have only partially setup the connection. | |
b40977d9 | 393 | */ |
913e5bf4 MC |
394 | if (ib_conn) { |
395 | iscsi_conn_stop(cls_conn, flag); | |
396 | /* | |
397 | * There is no unbind event so the stop callback | |
398 | * must release the ref from the bind. | |
399 | */ | |
39ff05db | 400 | iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ |
913e5bf4 | 401 | } |
b40977d9 | 402 | iser_conn->ib_conn = NULL; |
65e7ae7b OG |
403 | } |
404 | ||
75613521 MC |
405 | static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) |
406 | { | |
407 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
408 | ||
e5bd7b54 | 409 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
410 | iscsi_host_remove(shost); |
411 | iscsi_host_free(shost); | |
75613521 | 412 | } |
65e7ae7b OG |
413 | |
414 | static struct iscsi_cls_session * | |
412eeafa | 415 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 | 416 | uint16_t cmds_max, uint16_t qdepth, |
5e7facb7 | 417 | uint32_t initial_cmdsn) |
65e7ae7b OG |
418 | { |
419 | struct iscsi_cls_session *cls_session; | |
420 | struct iscsi_session *session; | |
412eeafa | 421 | struct Scsi_Host *shost; |
412eeafa | 422 | struct iser_conn *ib_conn; |
75613521 | 423 | |
962b4b52 | 424 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); |
75613521 MC |
425 | if (!shost) |
426 | return NULL; | |
427 | shost->transportt = iscsi_iser_scsi_transport; | |
428 | shost->max_lun = iscsi_max_lun; | |
429 | shost->max_id = 0; | |
430 | shost->max_channel = 0; | |
431 | shost->max_cmd_len = 16; | |
432 | ||
412eeafa MC |
433 | /* |
434 | * older userspace tools (before 2.0-870) did not pass us | |
435 | * the leading conn's ep so this will be NULL; | |
436 | */ | |
437 | if (ep) | |
438 | ib_conn = ep->dd_data; | |
439 | ||
440 | if (iscsi_host_add(shost, | |
441 | ep ? ib_conn->device->ib_device->dma_device : NULL)) | |
75613521 | 442 | goto free_host; |
65e7ae7b | 443 | |
1548271e MC |
444 | /* |
445 | * we do not support setting can_queue cmd_per_lun from userspace yet | |
446 | * because we preallocate so many resources | |
447 | */ | |
75613521 | 448 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
b8b9e1b8 | 449 | ISCSI_DEF_XMIT_CMDS_MAX, 0, |
2261ec3d | 450 | sizeof(struct iscsi_iser_task), |
7970634b | 451 | initial_cmdsn, 0); |
65e7ae7b | 452 | if (!cls_session) |
75613521 MC |
453 | goto remove_host; |
454 | session = cls_session->dd_data; | |
65e7ae7b | 455 | |
2747fdb2 | 456 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b | 457 | return cls_session; |
75613521 MC |
458 | |
459 | remove_host: | |
a4804cd6 | 460 | iscsi_host_remove(shost); |
75613521 | 461 | free_host: |
a4804cd6 | 462 | iscsi_host_free(shost); |
75613521 | 463 | return NULL; |
65e7ae7b OG |
464 | } |
465 | ||
466 | static int | |
358ff019 MC |
467 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
468 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 469 | { |
358ff019 | 470 | int value; |
65e7ae7b OG |
471 | |
472 | switch (param) { | |
473 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
474 | /* TBD */ | |
475 | break; | |
65e7ae7b | 476 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 477 | sscanf(buf, "%d", &value); |
65e7ae7b | 478 | if (value) { |
4f363882 | 479 | iser_err("DataDigest wasn't negotiated to None"); |
65e7ae7b OG |
480 | return -EPROTO; |
481 | } | |
482 | break; | |
483 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 484 | sscanf(buf, "%d", &value); |
65e7ae7b | 485 | if (value) { |
4f363882 | 486 | iser_err("DataDigest wasn't negotiated to None"); |
65e7ae7b OG |
487 | return -EPROTO; |
488 | } | |
489 | break; | |
65e7ae7b | 490 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 491 | sscanf(buf, "%d", &value); |
65e7ae7b | 492 | if (value) { |
4f363882 | 493 | iser_err("IFMarker wasn't negotiated to No"); |
65e7ae7b OG |
494 | return -EPROTO; |
495 | } | |
496 | break; | |
497 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 498 | sscanf(buf, "%d", &value); |
65e7ae7b | 499 | if (value) { |
4f363882 | 500 | iser_err("OFMarker wasn't negotiated to No"); |
65e7ae7b OG |
501 | return -EPROTO; |
502 | } | |
503 | break; | |
504 | default: | |
358ff019 | 505 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
506 | } |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
65e7ae7b OG |
511 | static void |
512 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
513 | { | |
514 | struct iscsi_conn *conn = cls_conn->dd_data; | |
515 | ||
516 | stats->txdata_octets = conn->txdata_octets; | |
517 | stats->rxdata_octets = conn->rxdata_octets; | |
518 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
519 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
520 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
521 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
522 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
523 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
524 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
87528227 | 525 | stats->custom_length = 4; |
65e7ae7b OG |
526 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
527 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ | |
528 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); | |
529 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; | |
530 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
531 | stats->custom[2].value = conn->eh_abort_cnt; | |
87528227 ED |
532 | strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
533 | stats->custom[3].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
534 | } |
535 | ||
7c53c6f8 MC |
536 | static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, |
537 | enum iscsi_param param, char *buf) | |
538 | { | |
539 | struct iser_conn *ib_conn = ep->dd_data; | |
540 | int len; | |
541 | ||
542 | switch (param) { | |
543 | case ISCSI_PARAM_CONN_PORT: | |
544 | case ISCSI_PARAM_CONN_ADDRESS: | |
545 | if (!ib_conn || !ib_conn->cma_id) | |
546 | return -ENOTCONN; | |
547 | ||
548 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
549 | &ib_conn->cma_id->route.addr.dst_addr, | |
550 | param, buf); | |
551 | break; | |
552 | default: | |
553 | return -ENOSYS; | |
554 | } | |
555 | ||
556 | return len; | |
557 | } | |
558 | ||
412eeafa | 559 | static struct iscsi_endpoint * |
10eb0f01 MC |
560 | iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
561 | int non_blocking) | |
65e7ae7b OG |
562 | { |
563 | int err; | |
564 | struct iser_conn *ib_conn; | |
412eeafa | 565 | struct iscsi_endpoint *ep; |
65e7ae7b | 566 | |
412eeafa MC |
567 | ep = iscsi_create_endpoint(sizeof(*ib_conn)); |
568 | if (!ep) | |
569 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 570 | |
412eeafa MC |
571 | ib_conn = ep->dd_data; |
572 | ib_conn->ep = ep; | |
573 | iser_conn_init(ib_conn); | |
65e7ae7b | 574 | |
412eeafa MC |
575 | err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, |
576 | non_blocking); | |
7d9c0de4 | 577 | if (err) |
412eeafa | 578 | return ERR_PTR(err); |
7d9c0de4 | 579 | |
412eeafa | 580 | return ep; |
65e7ae7b OG |
581 | } |
582 | ||
583 | static int | |
412eeafa | 584 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 585 | { |
412eeafa | 586 | struct iser_conn *ib_conn; |
65e7ae7b OG |
587 | int rc; |
588 | ||
412eeafa | 589 | ib_conn = ep->dd_data; |
65e7ae7b OG |
590 | rc = wait_event_interruptible_timeout(ib_conn->wait, |
591 | ib_conn->state == ISER_CONN_UP, | |
592 | msecs_to_jiffies(timeout_ms)); | |
593 | ||
594 | /* if conn establishment failed, return error code to iscsi */ | |
595 | if (!rc && | |
596 | (ib_conn->state == ISER_CONN_TERMINATING || | |
597 | ib_conn->state == ISER_CONN_DOWN)) | |
598 | rc = -1; | |
599 | ||
4f363882 | 600 | iser_info("ib conn %p rc = %d\n", ib_conn, rc); |
65e7ae7b OG |
601 | |
602 | if (rc > 0) | |
603 | return 1; /* success, this is the equivalent of POLLOUT */ | |
604 | else if (!rc) | |
605 | return 0; /* timeout */ | |
606 | else | |
607 | return rc; /* signal */ | |
608 | } | |
609 | ||
610 | static void | |
412eeafa | 611 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 612 | { |
1c83469d | 613 | struct iser_conn *ib_conn; |
65e7ae7b | 614 | |
412eeafa | 615 | ib_conn = ep->dd_data; |
b40977d9 MC |
616 | if (ib_conn->iser_conn) |
617 | /* | |
618 | * Must suspend xmit path if the ep is bound to the | |
619 | * iscsi_conn, so we know we are not accessing the ib_conn | |
620 | * when we free it. | |
621 | * | |
622 | * This may not be bound if the ep poll failed. | |
623 | */ | |
624 | iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); | |
625 | ||
65e7ae7b | 626 | |
4f363882 | 627 | iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state); |
65e7ae7b OG |
628 | iser_conn_terminate(ib_conn); |
629 | } | |
630 | ||
587a1f16 | 631 | static umode_t iser_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
632 | { |
633 | switch (param_type) { | |
f27fb2ef MC |
634 | case ISCSI_HOST_PARAM: |
635 | switch (param) { | |
636 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
637 | case ISCSI_HOST_PARAM_HWADDRESS: | |
638 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
639 | return S_IRUGO; | |
640 | default: | |
641 | return 0; | |
642 | } | |
3128c6c7 MC |
643 | case ISCSI_PARAM: |
644 | switch (param) { | |
645 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
646 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
647 | case ISCSI_PARAM_HDRDGST_EN: | |
648 | case ISCSI_PARAM_DATADGST_EN: | |
649 | case ISCSI_PARAM_CONN_ADDRESS: | |
650 | case ISCSI_PARAM_CONN_PORT: | |
651 | case ISCSI_PARAM_EXP_STATSN: | |
652 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
653 | case ISCSI_PARAM_PERSISTENT_PORT: | |
654 | case ISCSI_PARAM_PING_TMO: | |
655 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
656 | case ISCSI_PARAM_INITIAL_R2T_EN: |
657 | case ISCSI_PARAM_MAX_R2T: | |
658 | case ISCSI_PARAM_IMM_DATA_EN: | |
659 | case ISCSI_PARAM_FIRST_BURST: | |
660 | case ISCSI_PARAM_MAX_BURST: | |
661 | case ISCSI_PARAM_PDU_INORDER_EN: | |
662 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
663 | case ISCSI_PARAM_TARGET_NAME: | |
664 | case ISCSI_PARAM_TPGT: | |
665 | case ISCSI_PARAM_USERNAME: | |
666 | case ISCSI_PARAM_PASSWORD: | |
667 | case ISCSI_PARAM_USERNAME_IN: | |
668 | case ISCSI_PARAM_PASSWORD_IN: | |
669 | case ISCSI_PARAM_FAST_ABORT: | |
670 | case ISCSI_PARAM_ABORT_TMO: | |
671 | case ISCSI_PARAM_LU_RESET_TMO: | |
672 | case ISCSI_PARAM_TGT_RESET_TMO: | |
673 | case ISCSI_PARAM_IFACE_NAME: | |
674 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
675 | return S_IRUGO; |
676 | default: | |
677 | return 0; | |
678 | } | |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
65e7ae7b | 684 | static struct scsi_host_template iscsi_iser_sht = { |
7974392c | 685 | .module = THIS_MODULE, |
c1d786e6 | 686 | .name = "iSCSI Initiator over iSER", |
65e7ae7b | 687 | .queuecommand = iscsi_queuecommand, |
6410627e | 688 | .change_queue_depth = iscsi_change_queue_depth, |
65e7ae7b | 689 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
8072ec2f | 690 | .max_sectors = 1024, |
e28f3d5b | 691 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
65e7ae7b | 692 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 693 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 694 | .eh_target_reset_handler = iscsi_eh_recover_target, |
6b5d6c44 | 695 | .target_alloc = iscsi_target_alloc, |
65e7ae7b OG |
696 | .use_clustering = DISABLE_CLUSTERING, |
697 | .proc_name = "iscsi_iser", | |
698 | .this_id = -1, | |
699 | }; | |
700 | ||
701 | static struct iscsi_transport iscsi_iser_transport = { | |
702 | .owner = THIS_MODULE, | |
703 | .name = "iser", | |
704 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, | |
65e7ae7b OG |
705 | /* session management */ |
706 | .create_session = iscsi_iser_session_create, | |
75613521 | 707 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
708 | /* connection management */ |
709 | .create_conn = iscsi_iser_conn_create, | |
710 | .bind_conn = iscsi_iser_conn_bind, | |
711 | .destroy_conn = iscsi_iser_conn_destroy, | |
3128c6c7 | 712 | .attr_is_visible = iser_attr_is_visible, |
358ff019 MC |
713 | .set_param = iscsi_iser_set_param, |
714 | .get_conn_param = iscsi_conn_get_param, | |
7c53c6f8 | 715 | .get_ep_param = iscsi_iser_get_ep_param, |
358ff019 | 716 | .get_session_param = iscsi_session_get_param, |
89e984e2 | 717 | .start_conn = iscsi_conn_start, |
b40977d9 | 718 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
719 | /* iscsi host params */ |
720 | .get_host_param = iscsi_host_get_param, | |
721 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
722 | /* IO */ |
723 | .send_pdu = iscsi_conn_send_pdu, | |
724 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
725 | .init_task = iscsi_iser_task_init, |
726 | .xmit_task = iscsi_iser_task_xmit, | |
727 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 728 | .alloc_pdu = iscsi_iser_pdu_alloc, |
65e7ae7b OG |
729 | /* recovery */ |
730 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
731 | ||
732 | .ep_connect = iscsi_iser_ep_connect, | |
733 | .ep_poll = iscsi_iser_ep_poll, | |
734 | .ep_disconnect = iscsi_iser_ep_disconnect | |
735 | }; | |
736 | ||
737 | static int __init iser_init(void) | |
738 | { | |
739 | int err; | |
740 | ||
741 | iser_dbg("Starting iSER datamover...\n"); | |
742 | ||
743 | if (iscsi_max_lun < 1) { | |
4f363882 | 744 | iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); |
65e7ae7b OG |
745 | return -EINVAL; |
746 | } | |
747 | ||
65e7ae7b OG |
748 | memset(&ig, 0, sizeof(struct iser_global)); |
749 | ||
750 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
f19624aa | 751 | sizeof(struct iser_tx_desc), |
65e7ae7b | 752 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 753 | NULL); |
65e7ae7b OG |
754 | if (ig.desc_cache == NULL) |
755 | return -ENOMEM; | |
756 | ||
757 | /* device init is called only after the first addr resolution */ | |
758 | mutex_init(&ig.device_list_mutex); | |
759 | INIT_LIST_HEAD(&ig.device_list); | |
760 | mutex_init(&ig.connlist_mutex); | |
761 | INIT_LIST_HEAD(&ig.connlist); | |
762 | ||
75613521 MC |
763 | iscsi_iser_scsi_transport = iscsi_register_transport( |
764 | &iscsi_iser_transport); | |
765 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
766 | iser_err("iscsi_register_transport failed\n"); |
767 | err = -EINVAL; | |
768 | goto register_transport_failure; | |
769 | } | |
770 | ||
771 | return 0; | |
772 | ||
773 | register_transport_failure: | |
774 | kmem_cache_destroy(ig.desc_cache); | |
775 | ||
776 | return err; | |
777 | } | |
778 | ||
779 | static void __exit iser_exit(void) | |
780 | { | |
781 | iser_dbg("Removing iSER datamover...\n"); | |
782 | iscsi_unregister_transport(&iscsi_iser_transport); | |
783 | kmem_cache_destroy(ig.desc_cache); | |
784 | } | |
785 | ||
786 | module_init(iser_init); | |
787 | module_exit(iser_exit); |